Based on your experience, is advertising still a viable revenue model these days? I know that Google makes money from their ads systems. But what about other site like Facebook? I heard their ads system is not profitable. For some social networking site or other freebie online service site, the only thinkable way to make money is through advertising. But is it viable these days? Can your company actually survive only through advertising?
The channel can be using 3rd party ad tools like Google AdWords, or using your own ad management tool like what Facebook has done.
What's your experience on this?